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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.lang3.concurrent;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import org.apache.commons.lang3.ObjectUtils;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    /**<a name="line.21"></a>
<FONT color="green">022</FONT>     * &lt;p&gt;<a name="line.22"></a>
<FONT color="green">023</FONT>     * A very simple implementation of the {@link ConcurrentInitializer} interface<a name="line.23"></a>
<FONT color="green">024</FONT>     * which always returns the same object.<a name="line.24"></a>
<FONT color="green">025</FONT>     * &lt;/p&gt;<a name="line.25"></a>
<FONT color="green">026</FONT>     * &lt;p&gt;<a name="line.26"></a>
<FONT color="green">027</FONT>     * An instance of this class is passed a reference to an object when it is<a name="line.27"></a>
<FONT color="green">028</FONT>     * constructed. The {@link #get()} method just returns this object. No<a name="line.28"></a>
<FONT color="green">029</FONT>     * synchronization is required.<a name="line.29"></a>
<FONT color="green">030</FONT>     * &lt;/p&gt;<a name="line.30"></a>
<FONT color="green">031</FONT>     * &lt;p&gt;<a name="line.31"></a>
<FONT color="green">032</FONT>     * This class is useful for instance for unit testing or in cases where a<a name="line.32"></a>
<FONT color="green">033</FONT>     * specific object has to be passed to an object which expects a<a name="line.33"></a>
<FONT color="green">034</FONT>     * {@link ConcurrentInitializer}.<a name="line.34"></a>
<FONT color="green">035</FONT>     * &lt;/p&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>     *<a name="line.36"></a>
<FONT color="green">037</FONT>     * @since 3.0<a name="line.37"></a>
<FONT color="green">038</FONT>     * @version $Id: ConstantInitializer.java 1199894 2011-11-09 17:53:59Z ggregory $<a name="line.38"></a>
<FONT color="green">039</FONT>     * @param &lt;T&gt; the type of the object managed by this initializer<a name="line.39"></a>
<FONT color="green">040</FONT>     */<a name="line.40"></a>
<FONT color="green">041</FONT>    public class ConstantInitializer&lt;T&gt; implements ConcurrentInitializer&lt;T&gt; {<a name="line.41"></a>
<FONT color="green">042</FONT>        /** Constant for the format of the string representation. */<a name="line.42"></a>
<FONT color="green">043</FONT>        private static final String FMT_TO_STRING = "ConstantInitializer@%d [ object = %s ]";<a name="line.43"></a>
<FONT color="green">044</FONT>    <a name="line.44"></a>
<FONT color="green">045</FONT>        /** Stores the managed object. */<a name="line.45"></a>
<FONT color="green">046</FONT>        private final T object;<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        /**<a name="line.48"></a>
<FONT color="green">049</FONT>         * Creates a new instance of {@code ConstantInitializer} and initializes it<a name="line.49"></a>
<FONT color="green">050</FONT>         * with the object to be managed. The {@code get()} method will always<a name="line.50"></a>
<FONT color="green">051</FONT>         * return the object passed here. This class does not place any restrictions<a name="line.51"></a>
<FONT color="green">052</FONT>         * on the object. It may be &lt;b&gt;null&lt;/b&gt;, then {@code get()} will return<a name="line.52"></a>
<FONT color="green">053</FONT>         * &lt;b&gt;null&lt;/b&gt;, too.<a name="line.53"></a>
<FONT color="green">054</FONT>         *<a name="line.54"></a>
<FONT color="green">055</FONT>         * @param obj the object to be managed by this initializer<a name="line.55"></a>
<FONT color="green">056</FONT>         */<a name="line.56"></a>
<FONT color="green">057</FONT>        public ConstantInitializer(T obj) {<a name="line.57"></a>
<FONT color="green">058</FONT>            object = obj;<a name="line.58"></a>
<FONT color="green">059</FONT>        }<a name="line.59"></a>
<FONT color="green">060</FONT>    <a name="line.60"></a>
<FONT color="green">061</FONT>        /**<a name="line.61"></a>
<FONT color="green">062</FONT>         * Directly returns the object that was passed to the constructor. This is<a name="line.62"></a>
<FONT color="green">063</FONT>         * the same object as returned by {@code get()}. However, this method does<a name="line.63"></a>
<FONT color="green">064</FONT>         * not declare that it throws an exception.<a name="line.64"></a>
<FONT color="green">065</FONT>         *<a name="line.65"></a>
<FONT color="green">066</FONT>         * @return the object managed by this initializer<a name="line.66"></a>
<FONT color="green">067</FONT>         */<a name="line.67"></a>
<FONT color="green">068</FONT>        public final T getObject() {<a name="line.68"></a>
<FONT color="green">069</FONT>            return object;<a name="line.69"></a>
<FONT color="green">070</FONT>        }<a name="line.70"></a>
<FONT color="green">071</FONT>    <a name="line.71"></a>
<FONT color="green">072</FONT>        /**<a name="line.72"></a>
<FONT color="green">073</FONT>         * Returns the object managed by this initializer. This implementation just<a name="line.73"></a>
<FONT color="green">074</FONT>         * returns the object passed to the constructor.<a name="line.74"></a>
<FONT color="green">075</FONT>         *<a name="line.75"></a>
<FONT color="green">076</FONT>         * @return the object managed by this initializer<a name="line.76"></a>
<FONT color="green">077</FONT>         * @throws ConcurrentException if an error occurs<a name="line.77"></a>
<FONT color="green">078</FONT>         */<a name="line.78"></a>
<FONT color="green">079</FONT>        public T get() throws ConcurrentException {<a name="line.79"></a>
<FONT color="green">080</FONT>            return getObject();<a name="line.80"></a>
<FONT color="green">081</FONT>        }<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>        /**<a name="line.83"></a>
<FONT color="green">084</FONT>         * Returns a hash code for this object. This implementation returns the hash<a name="line.84"></a>
<FONT color="green">085</FONT>         * code of the managed object.<a name="line.85"></a>
<FONT color="green">086</FONT>         *<a name="line.86"></a>
<FONT color="green">087</FONT>         * @return a hash code for this object<a name="line.87"></a>
<FONT color="green">088</FONT>         */<a name="line.88"></a>
<FONT color="green">089</FONT>        @Override<a name="line.89"></a>
<FONT color="green">090</FONT>        public int hashCode() {<a name="line.90"></a>
<FONT color="green">091</FONT>            return getObject() != null ? getObject().hashCode() : 0;<a name="line.91"></a>
<FONT color="green">092</FONT>        }<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        /**<a name="line.94"></a>
<FONT color="green">095</FONT>         * Compares this object with another one. This implementation returns<a name="line.95"></a>
<FONT color="green">096</FONT>         * &lt;b&gt;true&lt;/b&gt; if and only if the passed in object is an instance of<a name="line.96"></a>
<FONT color="green">097</FONT>         * {@code ConstantInitializer} which refers to an object equals to the<a name="line.97"></a>
<FONT color="green">098</FONT>         * object managed by this instance.<a name="line.98"></a>
<FONT color="green">099</FONT>         *<a name="line.99"></a>
<FONT color="green">100</FONT>         * @param obj the object to compare to<a name="line.100"></a>
<FONT color="green">101</FONT>         * @return a flag whether the objects are equal<a name="line.101"></a>
<FONT color="green">102</FONT>         */<a name="line.102"></a>
<FONT color="green">103</FONT>        @Override<a name="line.103"></a>
<FONT color="green">104</FONT>        public boolean equals(Object obj) {<a name="line.104"></a>
<FONT color="green">105</FONT>            if (this == obj) {<a name="line.105"></a>
<FONT color="green">106</FONT>                return true;<a name="line.106"></a>
<FONT color="green">107</FONT>            }<a name="line.107"></a>
<FONT color="green">108</FONT>            if (!(obj instanceof ConstantInitializer&lt;?&gt;)) {<a name="line.108"></a>
<FONT color="green">109</FONT>                return false;<a name="line.109"></a>
<FONT color="green">110</FONT>            }<a name="line.110"></a>
<FONT color="green">111</FONT>    <a name="line.111"></a>
<FONT color="green">112</FONT>            ConstantInitializer&lt;?&gt; c = (ConstantInitializer&lt;?&gt;) obj;<a name="line.112"></a>
<FONT color="green">113</FONT>            return ObjectUtils.equals(getObject(), c.getObject());<a name="line.113"></a>
<FONT color="green">114</FONT>        }<a name="line.114"></a>
<FONT color="green">115</FONT>    <a name="line.115"></a>
<FONT color="green">116</FONT>        /**<a name="line.116"></a>
<FONT color="green">117</FONT>         * Returns a string representation for this object. This string also<a name="line.117"></a>
<FONT color="green">118</FONT>         * contains a string representation of the object managed by this<a name="line.118"></a>
<FONT color="green">119</FONT>         * initializer.<a name="line.119"></a>
<FONT color="green">120</FONT>         *<a name="line.120"></a>
<FONT color="green">121</FONT>         * @return a string for this object<a name="line.121"></a>
<FONT color="green">122</FONT>         */<a name="line.122"></a>
<FONT color="green">123</FONT>        @Override<a name="line.123"></a>
<FONT color="green">124</FONT>        public String toString() {<a name="line.124"></a>
<FONT color="green">125</FONT>            return String.format(FMT_TO_STRING, Integer.valueOf(System.identityHashCode(this)),<a name="line.125"></a>
<FONT color="green">126</FONT>                    String.valueOf(getObject()));<a name="line.126"></a>
<FONT color="green">127</FONT>        }<a name="line.127"></a>
<FONT color="green">128</FONT>    }<a name="line.128"></a>




























































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